31420520 has 32 divisors (see below), whose sum is σ = 72034920. Its totient is φ = 12330240.

The previous prime is 31420517. The next prime is 31420559. The reversal of 31420520 is 2502413.

It can be written as a sum of positive squares in 4 ways, for example, as 27102436 + 4318084 = 5206^2 + 2078^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5291 + ... + 9530.

Almost surely, 2^31420520 is an apocalyptic number.

It is an amenable number.

31420520 is an abundant number, since it is smaller than the sum of its proper divisors (40614400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31420520 is a wasteful number, since it uses less digits than its factorization.

31420520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14885 (or 14881 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 31420520 is about 5605.4009669247. The cubic root of 31420520 is about 315.5521348641.

Adding to 31420520 its reverse (2502413), we get a palindrome (33922933).

The spelling of 31420520 in words is "thirty-one million, four hundred twenty thousand, five hundred twenty".